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Finding the Fourth Proportional to 485,720.78, 728,790.55 and 260,818.20

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Solution

The fourth proportional to 485,720.78, 728,790.55 and 260,818.20 is: 391,339.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,720.78 : 728,790.55 = 260,818.20 : x
  2. Step 2: Convert to fraction form
    485,720.78/728,790.55 = 260,818.20/x
  3. Step 3: Cross multiply
    485,720.78x = 728,790.55 × 260,818.20
  4. Step 4: Simplify right side
    485,720.78x = 190,081,838,775.97
  5. Step 5: Solve for x
    x = 190,081,838,775.97/485,720.78
  6. Step 6: Final answer
    x = 391,339.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.